Effect of strain rate on environmental hydrogen embrittlement susceptibility of a severely cold-rolled Al-Cu alloy

被引：38
作者：
Safyari, Mahdieh [1 ]
Moshtaghi, Masoud [2 ,3 ]
Kuramoto, Shigeru [4 ]
机构：
[1] Ibaraki Univ, Grad Sch Sci & Engn, Dept Mech Syst Engn, 4-12-1 Nakanarusawa, Hitachi, Ibaraki 3168511, Japan
[2] Ibaraki Univ, Grad Sch Sci & Engn, Inst Quantum Beam Sci, 4-12-1 Nakanarusawa, Hitachi, Ibaraki 3168511, Japan
[3] Univ Tehran, Coll Engn, Sch Met & Mat Engn, Tehran 111554563, Iran
[4] Ibaraki Univ, Coll Engn, Dept Mech Syst Engn, 4-12-1 Nakanarusawa, Hitachi, Ibaraki 3168511, Japan
来源：
VACUUM | 2020年 / 172卷
基金：
日本学术振兴会;
关键词：
Strain rate; Severe cold rolling; Al-Cu alloy; Environmental hydrogen embrittlement; Thermal desorption spectroscopy; MG; FRACTURE; TRANSPORT; MICROSTRUCTURE; DISLOCATIONS; TOUGHNESS; STRENGTH; BEHAVIOR; NI;
D O I：
10.1016/j.vacuum.2019.109057
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This study investigated the effect of strain rate ranging between 1.7 x 10(-4) and 1.7 x 10(-8) s(-1) on environmental hydrogen embrittlement behavior in a severely cold-rolled Al-Cu alloy. Elongations of the specimens tensile-tested in humid air (HA) decreased significantly compared with the specimens tensile-tested in dry nitrogen gas at strain rates of 1.7 x 10(-5), 1.7 x 10(-6) and 1.7 x 10(-7) s(-1). With decreasing the strain rate, the hydrogen embrittlement sensitivity (HES) index of the alloy first increased and then decreased with the maximum occurring at 1.7 x 10(-6) s(-1), exhibited a largest amount of desorbed hydrogen. The characteristics of the fracture behavior of the specimens tensile-tested in HA also changed with the strain rate. Thermal desorption spectroscopy results revealed that the amount of trapped hydrogen at dislocations and/or second phase particles has a correlation with HES index.
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页数：5
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